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jgrb50192-sup-0001-2012JB009692RRtext01.txtplain text document0KSection S.1: Describes the temporal clustering of seismicity and the characteristics of earthquake sequences in the back-arc region in terms of event time and magnitude.
jgrb50192-sup-0002-2012JB009692RRfs01.epsPS document2351KSeismicity in the Andaman Sea back-arc region between 1964 and 2009. (a) Thin gray circles indicate Mw in the greater Sumatra-Andaman region (area shown in Figure 1) as reported in the global CMT catalog. Bold circles indicate Mw in the back-arc region as reported in the global CMT catalog. Histogram in the background indicates number of events per year (with mb >= 4.5) in the back-arc region as reported in the ISC catalog. (b) Circles indicate mb for earthquakes within the Andaman Back-Arc Spreading Center (ABSC) as reported in the ISC catalog. Crosses indicate Mw for earthquakes within the ABSC as reported in the global CMT catalog. (c) Number of events per year in the ABSC as reported in the ISC catalog. Gray indicates all events in the ABSC. To account for a uniform detection threshold, black bars indicates number of events with mb >= 4.5.
jgrb50192-sup-0003-2012JB009692RRfs02.epsPS document2202KCharacteristics of earthquake sequences in the ABSC in terms of event time and magnitude. Circles indicate mb as reported in the ISC catalog. Crosses indicate Mw as reported in the global CMT catalog. Typical for swarm-like sequences, the largest magnitudes occur in the middle of the sequences and magnitudes do not decay as observed in typical main shock-aftershock sequences.
jgrb50192-sup-0004-2012JB009692RRfs03.epsPS document673KCharacteristics of an earthquake sequence in the northeastern part of the back-arc region (cluster C1 in Figure 4b and 5) in terms of event time and magnitude. Circles indicate mb as reported in the ISC catalog. Crosses indicate Mw as reported in the global CMT catalog. A precursor event on July 25 is followed by the main shock on July 29. 2004. In contrast to the swarms in the ABSC, magnitudes rapidly decrease after the main shock, suggesting a typical main shock-aftershock behavior of this sequence.
jgrb50192-sup-0005-2012JB009692RRfs04.epsPS document1645KCharacteristics of earthquake sequences in the northeastern part of the back-arc region (cluster C3 in Figure 4d and 5) in terms of event time and magnitude. Circles indicate mb as reported in the ISC catalog. Crosses indicate Mw as reported in the global CMT catalog. Sequences in a, b, d show typical swarm-like characteristics, whereas the sequence in c indicates a main shock-aftershock behavior.
jgrb50192-sup-0006-2012JB009692RRtext02.txtplain text document4KSection S.2: Describes purpose, details, and results of the assessment of absolute location robustness.
jgrb50192-sup-0007-2012JB009692RRfs05.epsPS document4324KArrows indicate direction and amplitude of absolute mislocation of epicenters (in kilometers) caused by using a global 1-D velocity model (ak135). Gray arrows correspond to a synthetic station configuration (gray triangles in inset map), reflecting pure model effects. Black arrows correspond to a realistic station configuration (black triangles in inset map), reflecting combined effect of 3-D structure and network geometry. Position of synthetic hypocenters is indicated by black dots. Tectonic features (after Curray [2005]) are indicated by thin gray lines, ridge segments as defined by Kamesh Raju et al. [2004] are indicated by bold gray lines. Circles in inset map correspond to great-circle distances in degree.
jgrb50192-sup-0008-2012JB009692RRtext03.txtplain text document3KSection S.3: Describes purpose, details, and results of b-value analysis
jgrb50192-sup-0009-2012JB009692RRfs06.epsPS document1333Kb-values for three major swarms in the ABSC derived from mb as reported in the ISC catalog. Dots indicate cumulative sum of magnitude readings, histograms indicate absolute number of magnitude reading per magnitude bin.
jgrb50192-sup-0010-2012JB009692RRfs07.epsPS document2420Kb-values for three different subregions in the back-arc derived from mb in the ISC catalog (a-c) and Mw in the global CMT catalog (d-f). Dots indicate cumulative sum of magnitude readings, histograms indicate absolute number of magnitude reading per magnitude bin. b-values in the ABSC appear higher than elsewhere in the back-arc region.
jgrb50192-sup-0011-2012JB009692RRtext04.txtplain text document3KSection S.4: Describes purpose, details, and results of CLVD analysis of global CMT solutions
jgrb50192-sup-0012-2012JB009692RRfs08.epsPS document5807KCMT solutions with significant non-double-couple components (|epsilon| > 0.2) in the back-arc region. Label left of beach-ball symbols denotes year/month of event. Mechanisms labeled vPC1-vPC3 fall in the category of vertical-P CLVD earthquakes, mechanism labeled vTC1 falls in the category of a vertical-T CLVD earthquake.
jgrb50192-sup-0013-2012JB009692RRtext05.txtplain text document1KSection S.5: Describes additional regional gravity and magnetic anomalies derived from satellite data.
jgrb50192-sup-0014-2012JB009692RRfs09.epsPS document5412K(a) Satellite-derived free-air gravity anomalies [Sandwell and Smith, 2009], draped over bathymetric relief. Dots indicate relocated seismicity in the back-arc region. White and gray dots indicate events with CMT solutions. (b) Magnetic anomaly data (EMAG2 V2, Maus et al. [2009]) draped over bathymetric relief.
jgrb50192-sup-0015-2012JB009692RRtext06.txtplain text document2KSection S.6: Describes purpose, details, and results of Coulomb-stress modeling using different dike geometries
jgrb50192-sup-0016-2012JB009692RRfs10.epsPS document4817KResults of the Coulomb-stress modeling for different dike geometries along segment C of the ABSC. The green line indicates the along-strike extent of the hypothetical dike, black dots indicate epicenters of the 2006 earthquake swarm, black bars indicate direction of CMT B axes. Faults identified from high-resolution bathymetric data are shown by black. (a) Dike geometry described in section 'Kinematics of the ABSC' of the paper. (b) Dike height reduced to 1 km. (c) Along-strike extent reduced to 33 km. (d) Tensile opening reduced to 0.5 m.
jgrb50192-sup-0017-2012JB009692RRreadme.txtplain text document7KSupporting Information

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